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Upgrade from AdvaSoft for Windows to NT4 and OPC

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Upgrade from AdvaSoft for Windows to NT4 and OPC It is not recommended to do a live upgrade. Depending on what ASfW version is being used, it might be that you will need a new AdvaBuild, too. This means creating new Target Code and downloading it, which is definitely impossible on-line.

Problems "Upgrade from AdvaSoft for Windows to NT4 and OPC" resolves the following:

Upgrade from AdvaSoft for Windows to NT4 and OPC Application area: Electric Utilities

I will be performing an upgrade from AdvaSoft for Windows to OPC and Fix 7.0. The problem is that this will have to be done on a live plant - shutdown is not possible. Has anybody done a live upgrade before? We have two exsisting stations running in parallel (configured as standalone operator stations). I want to upgrade one machine first, but what will the "old" machine do when the new database is downloaded into the PLC? Can the windows 3.11 machine still read from new database in the PLC? I am afraid that I might be blind for the duration of the upgrade.